Numerical investigation on boiling flow of liquid nitrogen in a vertical tube using bubble number density approach

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• 作者：Xuefeng Shao ; Xiangdong Li ; Rongshun Wang
• 刊名：Heat and Mass Transfer
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：52
• 期：4
• 页码：877-886
• 全文大小：728 KB
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• 作者单位：Xuefeng Shao (1)
  Xiangdong Li (1)
  Rongshun Wang (1)
  
  1. School of Mechanical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China
  
• 刊物类别：Engineering
• 刊物主题：Engineering Thermodynamics and Transport Phenomena
  Industrial Chemistry and Chemical Engineering
  Thermodynamics
  Physics and Applied Physics in Engineering
  Theoretical and Applied Mechanics
  Engineering Fluid Dynamics
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1181

文摘

An average bubble number density (ABND) model was formulated and numerically resolved for the subcooled flow boiling of liquid nitrogen. The effects of bubble coalescence and breakup were taken into account. Some new closure correlations describing bubble nucleation and departure on the heating surface were selected as well. For the purpose of comparison, flow boiling of liquid nitrogen was also numerically simulated using a modified two-fluid model. The results show that the simulations performed by using the ABND model achieve encouraging improvement in accuracy in predicting heat flux and wall temperature of a vertical tube. Moreover, the influence of the bubble coalescence and breakup is shown to be great on predicting overall pressure beyond the transition point.